feat(medusa,core-flows,types): add cart <> tax integration workflows + steps (#6580)

what:

- adds tax lines to cart when item operations take place

RESOLVES CORE-1821
RESOLVES CORE-1822
RESOLVES CORE-1823
RESOLVES CORE-1824

packages/types/src/cart/workflows.ts

@@ -1,3 +1,5 @@
+import { CustomerDTO } from "../customer"
+import { ProductDTO } from "../product"
 import { CartDTO, CartLineItemDTO } from "./common"
 import { UpdateLineItemDTO } from "./mutations"
 
@@ -70,7 +72,7 @@ export interface CreateCartWorkflowInputDTO {
 
 export interface AddToCartWorkflowInputDTO {
   items: CreateCartCreateLineItemDTO[]
-  cart: CartDTO
+  cart: CartWorkflowDTO
 }
 
 export interface UpdateCartWorkflowInputDTO {
@@ -91,3 +93,8 @@ export interface CreatePaymentCollectionForCartWorkflowInputDTO {
   amount: number
   metadata?: Record<string, unknown>
 }
+
+export interface CartWorkflowDTO extends CartDTO {
+  customer?: CustomerDTO
+  product?: ProductDTO
+}

packages/types/src/tax/common.ts

@@ -165,6 +165,7 @@ interface TaxLineDTO {
   rate: number | null
   code: string | null
   name: string
+  provider_id: string
 }
 
 export interface ItemTaxLineDTO extends TaxLineDTO {